How to Get the Most from This Calculator
This calculator is built to be fast, clean, and completely private. It covers the four basic operations — addition, subtraction, multiplication, and division — along with a full set of scientific functions, all in a single compact screen that feels right at home on a phone or a desktop. Because every calculation runs locally in your browser, you can use it fully offline, and none of your keystrokes are ever sent to a server.
The scientific rows give you sine, cosine, and tangent (choose degrees or radians with the DEG/RAD toggle), base-10 logarithm, natural logarithm, square root, powers, factorial, percent, parentheses, and the constant pi. Just below sits the familiar number pad, and the large display shows your current expression with a live preview of the answer as you type. Press equals to commit the result, or tap any entry in the short history list to bring a previous calculation back.
You can also type instead of tapping. Digits, +, -, *, /, ^, and parentheses all work from the keyboard; Enter evaluates, Backspace deletes the last character, and Escape clears everything. The percent key divides a value by 100, factorial works for whole numbers and decimals through the gamma function, and the history list keeps your last ten results so you never lose track of a number.
- Use DEG for everyday angles and RAD for calculus and trigonometry problems.
- Parentheses follow the standard order of operations, and powers are right-associative.
- Dividing by zero returns infinity, while invalid input such as a mismatched parenthesis shows an error.
- Use the share button to copy a link to this tool or send it to another device.
Frequently Asked Questions
How do I switch between degrees and radians?
Tap the DEG/RAD button at the bottom of the keypad. The active mode is shown on the button itself, and the sine, cosine and tangent functions use that mode.
Can I use my computer keyboard?
Yes. Digits, +, -, *, /, ^ and parentheses work directly. Enter evaluates, Backspace deletes the last character, and Escape clears the screen.
Are my calculations saved anywhere?
The recent history is stored locally in your browser. No data is sent to a server, and you can clear it at any time.
Does it work offline?
Yes. The calculator is a single file that runs fully offline once it has been loaded.